Fueled by Pain by Vindexus

This enemy revels in its own pain. Whenever this enemy takes damage, including self-inflicted damage, it becomes visibly more dangerous and increases its damage die size by one. If its damage is already at d20, add an additional d20 to its rolls and take the highest. If this enemy goes for a minute without taking or dealing damage, or is healed, its damage die resets to its original size.